Jack for concrete forms



J; C; HANSON JACK FOR CONCRETE FORMS 1923 a sn ens-sneu 1 Filed Sept. 4.

NMWNRN INVENTOR. JlZHmsorI,

mafwnig ATTORNEY.

@ci ii, 1924.- 1,510,743

J. C. HANSON JACK FOR CONCRETE FORMS Filed Sept. 4 1923 2 Shets-Shee't 2 g5 INVENTOR.

a, Q f 16350275011. y {ET $4M, 3 I ATTORNEY."

Patented Oct. 7, 1924.

'JOSEPH C. HANSON,

or MOVILLE, IOWA.

JACK FOR CONCRETE FORMS.

Application filed September To all whom it may concern."

Be it known that I, JosErH C. HANsoN, a citizen-of the United States, and a resi dent of Moville, in the county of VVoodbury and State of Iowa, have invented certain new and useful Improvementsin Jacks for Concrete Forms, of which the following is a specification.

In concrete pavement construction where the forms consist of steel beams laid end to end along the. sides of the roadway and having their abutting end portions joined and supported by pedestals, it is essential that the beams be level, with respect to each other, which necessitates the pedestals and the ends of the beams being raised and held with the rails in mutually level positions while earth or other material is tamped or insertedunder the base of the pedestal. Heretofore this has been accomplished by workmen grasping the pedestal and the flanges of the beams and holding the same while another workman tamps earth below the pedestal. This is a clumsy and arduous task and it is difficult to accuratelylevel the beams.

My invention has, therefore, for its primary, object the production of a jack embodying certain novel features of construction and arrangement of parts whereby the beams and their pedestals may be, easily and accurately raised to and supported at any desired height while the operator tamps earth under the pedestal.

'These objects and advantages I successfully attain in the embodiment hereinafter described, defined in the appended claims and illustrated in the accompanying drawings,'which form a part of this application, and in which like characters of reference designate corresponding parts throughout the several views, of which;

. Fig. 1' is a side-elevation of a device constructed in accordance with my invent1on and as applied;

Fig. 2 is a front elevation of the same, the fulcrum leg being omitted;

Fig. 3 is a front elevation of the fulcrum le Fig. 4 is avfront elevation of the rear leg; and

Fig. 5 is a fragmentary of one of the pedestal grips.

Referring now to the illustrations, the usual or familiar type of beam used for concrete pavement forms is represented by perspective view 4, 1923. Serial No. 660,785.

the base plate, 6, the vertical web, 7, the horizontal head, .8, and front flange, 9. The pedestal employed with this type of beam consists of the base plate. 17,-and the rearwardly offset upright plate, 10, having a horizontal head plate, 11. As is well known the pedestal serves to support the abutting ends of two beams, the bases, 6, of the beams resting upon the pedestal base, 7, with the pedestal flange or head, 11, en-

gaged with the under-side ofthe beam head, 8, and the flange, 9, of the latter, resting adjacent the front or outer side of theupright, 10. i

The jack consists preferably of an elongated cylindrical lever 12, having its outer or front end pivotally secured to a 1 suitable leg, 13, preferably forked atits upper end to receive the lever, 12, the'arms, 14, thereof being provided with arcuate slots, 15, through which the pivot bolt, 16,

extends, whereby the leg may be swung to its operating position as shown in Figs. 1 and 2, and to an inoperative position adjacent the top and substantially in parallelism with the lever, 12, for convenience in handling the device when not in use, the leg being held releasably in such inoperative position by meansof spring clips, 17, on the leg which releasably engage the opposit sides of the lever, 12.

From the lever pivot-ally depends means for so engaging the pedestal that the pedestal and the end portions of the beams supported thereby may be raised through the medium of thelever, 12, said means in the present embodiment consisting of two bars, 18 and 19, interconnected at their lower ends by a cross member, 20, at least one of said bars being pivoted to said cross member. The bars are normally disposed in approximately parallelism and are adapted to be positioned, respectively, adjacent the side edges of the pedestal upright, 10. The said bars, 18, are also offset as at 21, to conform to the pedestal upright, 10. The upper ends ofv the. bars, 18 and 19, are provided with eyes, 22and 23, respectively through which freely passes a bolt, 24, having fixed thereon between the eyes a sleeve, 25, formed with, a collar, 26, on the ends upright projecting ears, 28, ,engageable with thenndersi'de of thepedest-al head, 11. The offset portion, 21, of the bar 18, is provided on its underside with a hook, 29, engageable with the side edges of the offset portion of the pedestal upright, i0. The upper end portions of the bars, 18 and 11.9 are interconnected by a retracting link. as the spring 30, which, it will be clear, holds the hooks, 27 and 29, yieldably engaged with the pedestal.

The bolt, 2%, is provided with a head, 31, whichprevents displacement of the bar, 18, from the bolt andon the opposite side of the eye,;-22, the bolt is provided with a cross pin or other suitable stop, 32, engageable' with the eye, 22. Movement of the-eye 23, on the bolt and in the direction of. the head ofthe bolt is prevented by a suitable stop as the Washer, 33, encircling the bolt; and the cross pin, 34, projecting through the bolt. Y

The pedestal gripping means is readily engaged with the-pedestal, by first engaging thehook 29, with the offset portion of the pedestal upright, then tilting the device a sufficient distance in the direction of the arm, 19, to permit engagement of the hook, 27, ofthe said arm, 19, with the adjacent side edge of the pedestal, then swinging the bar, 18, as shown in dotted lines in Fig. 2, to permit its hook, 27, to be engagedwith the other side edge of the pedestal. "Nith the device thus applied and the leg, 13, resting upon the ground as shown in F 1, upward 'movement of the free end of the lever lifts the gripping means slightly to bring the hook portions, 28, into engagement with the pedestal head, 11, then movement of the lever is continued the pedestal and the beams resting thereon may be lifted to any desired height and held-in such position. by means of a leg, 35, which. like the leg, 13, is forked at its upper end with its arms disposed on opposite sides of the lever and provided with arcuate slots, 36, through which and the lever passes a pivot bolt, 37,by means of which mounting, the leg, 35, may be swung to an inoperative position against the underside of the lever, as indicated in broken lines -in 1, in which position it may be held releasably by means of a ring, 38, pivoted on the leg, 35, and adapted to be swung over on the end of the lever. It is thought the removing operation of the de vice from the pedestal, is obvious. --Although l have illustrated and herein described but one-embodiment of the invention, I would not be understood as being limited to such specific construction, for

various alterations and modifications may be made intlie details of construction and arrangement of parts herein disclosed, without departmg from the spirlt and scope of theinvention, as defined in the appended claims.

Having thus described my invention, what Iclaim as new and desire to secure by Let ters Patent of the United States, is:

1. A jack for lifting a concrete form pedestal having upwardly-extending sup porting means, embodying a suitably fulcrumed lever, and a pair of gripping bars mounted thereon to move relatively'toward and from each other to engage and disengagewith and from the opposite sides of said means, and pivotally interconnei-ted at their free ends.

2. A jack for lifting aconcrete form pedestal having upwardly extendingheaded supporting means, embodying a suitably fulcrumed lever, a cross bolt carriedthereby, depending bars on the bolt, and projections on the bars engageable with'opposite sides of the said means and the under side of the head thereof, at least one of said bars being slidable on the bolt to permit the bars being moved relativelyone toward and from the other to engage and disengage said projections with and from said means. I 3. A jack for lifting a concrete form pedestal having an upright supporting plate and head flange, comprising a suitably ful crumed lever, a cross bolt carried thereby, a pair of bars depending from the bolt, hooks on the bars engageable with the side edges of the plate'and having parts engageable with the head flange, and a cross member pivotally interconnecting the lower ends of said bars, at least one of the bars being movable on the bolt, to permit ,relative movement of the bars, one toward and from the other to engage and disengage the hooks with and from the plate. r

A jack for lifting a concrete form pedestal having an offset upright plate, comprising a suitable lifting member, a horizontal bolt carried thereby, bars depend ing from the bolt, books on the bars err-- gageable with the side edges of the plate and having parts engageable with t he under side of the head, and a hook on'one of 'the bars engageable under the side edge of the offset portion of theplate. y

5. A jack for lifting a concrete form pedestal having an offset upright headed plate, comprising a suitable lifting member, a horizontal bolt carried thereby, bars depending from the bolt, hooks on the bars engageable with the side edges of the plate and having parts engageable with the under side of the head, and a hook on one of the bars engageable under the side edge of the offset portion of the plate.

6. A jack for l'fting a concrete form pedestalhaving an uprightsupportingplate, comprising a suitable lifting member, a horizontal bolt carried thereby, bars depending from the bolt, elements on the bars for engaging the sides of the plate, a cross member pivotally interconnecting the lower ends of the bars, the bars being so mounted on the bolt as to permit relative swinging of the bars, one toward and from the other, to en gage and disengage said elements with and from the plate, and a retracting link between the bars.

7. A jack for lifting a concrete form pedestal having an upright offset headed supporting plate, comprising a suitable lifting member, a horizontal bolt carried thereby, bars depending from the bolt, elements on the bars for engaging the sides of the plate, a hook on one of the bars engageable under the side edge of the ofiset portion of the plate, a cross member pivotally interconnecting the lower ends of the bars, the bars being so mounted on the bolt as to permit relative swinging of the bars, one to ward and from the other, and a retracting link between the bars.

In testimony whereof, I have hereunto set my hand this 28th day of August, 1923. J OSEPH C. HANSON. 

